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FURNACE AIR FILTER TABLE
AIR FILTER LOCATED IN BLOWER COMPARTMENT
FURNACE
CASING
WIDTH
(IN.)
FILTER SIZE (IN)
FILTER
TYPE
Side
Return†*
Bottom
Return*
17---1/ 2 (1) 16 x 25 x 1 (1) 16 x 25 x 1 Cleanable
21 (1) 16 x 25 x 1 (1) 20 x 25 x 1 Cleanable
24---1/ 2 (1 or 2) 16 x 25 x 1 (1) 24 x 25 x 1 Cleanable
AIRFILTERLOCATEDINFILTERCABINET
FILTER CABINET
HEIGHT (IN)
FILTER
SIZE (IN)
FILTER
T
Y
PE
16 (1) 16 x 25 x 1*
Cleanable or
Disposable
20
(1) 20 x 25 x 1*
or (1) 20 x 25 x
4---5/ 16
Cleanable or
Disposable
24
(1) 24 x 25 x 1*
or (1) 24 x 25 x
4---5/ 16
Cleanable or
Disposable
*Factory---provided with the furnace. Filters may be field modified by
cutting filter material and support rods (3) in filters.
{ Upflow only. A lternate sizes and additional filters may be ordered from
your dealer.
PERSONAL INJURY HAZARD
Failure to follow this warning could result in personal
injury .
Use care w hen cutting support rods in filters to protect
against flying pieces and sharp rod ends. Wear safety
glasses, gloves, and appropriate protective clothing.
!
WARNING
COMBUSTION AREA AND VENT
SYSTEM
V isually inspect the combustion area and ve nt system before each
heating season. Make sure that all PVC pipes leading into the
combustion area and vent are free from any cracks and sags.
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal
injury or death.
If holes are found in the pipes or if any portion has
become disconnected, toxic fumes can escape into your
home. DO NOT OPERATE YOUR FURNACE. Call
your dealer for service.
!
WARNING
Check the combustion --air intake and vent pipe on the outside of
your home for blockage.
When dirt, soot, scale, or rust is allowed to build up, your furnace
can suffer a loss of efficiency and perform improperly.
Accumulations on the main burners can result in firing out of
normal sequence. This delayed ignition creates an alarmingly
loud sound.
UNIT OPERATION HAZARD
Failure to follow this caution may result in property
damage.
If your furnace makes an especially loud noise when the
main burners light, shut down your furnace and call your
dealer.
CAUTION
!
To inspect the combustion area and vent system, you will need
a flashlight. Refer to Fig. 3 and proceed as follows:
1. Turn off the gas and electrical supplies to the furnace and
remove the main furnace door. (See Fig. 8, 9, and 10.)
2. Remove burner enclosure front. (See Fig. 36.)
Inspect the gas burners, igniter area, and remainder of furnace for
dirt, rust, soot, or scale.
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal
injury or death.
If dirt, rust, soot, or scale accumulations are found, call
your dealer. Do not operate your furnace.
!
WARNING
3. Inspect the combustion-- air and vent PVC pipes for sags,
holes, cracks, water leaks, blockage or disconnections.
Horizontal portions of pipes must slope downward toward
furnace.
4. Reinstall burner enclosure front.
5. If your furnace is free of the above conditions, replace
main furnace door and turn on electrical and gas supplies
to the furnace. (See Fig. 15, 16, and 17.)
6. Start the furnace and observe its operation. Watch the
burner flames to see if they are clear blue, almost
transparent. (See Fig. 37.) If you observe a suspected
malfunction, or the burner flames are not clear blue, call
your dealer.
A00223
Fig. 36 -- Remove Burner Enclosure Front